Not up and running yet but hope to be inside a month.
Checkout the TurboSport UK forums as there are heaps of posts about their pros and cons.
From my understanding there is no benefit (i.e. more power) than that of the 45's but it's the lower costs and easer setting up that make them more popular these days.
Plus they apparently don't go out of tune like webbers do.
Have a search on TurboSport and make your own mind up.
If it's performance you are after and have the money then you really can't go wrong with the 45's.
Cheers
Matt